Compare/Head to head

Folderly vs Warmbox

Same facts, side by side: starting price, free tier, MCP, API and what each one is actually built for.

Starting price

Folderly

$79/mo Free tier

Folderly tests email deliverability and monitors inbox placement. Inbox Insights has a free tier with 2 tests a month, then $79/mo for 100 tests.

Where Folderly fits

Outbound teams whose mail is landing in spam and need placement proof
RevOps watching DMARC and inbox placement across many domains
Agencies that want a deliverability report to show clients
Senders who already have warmup and now need monitoring

Warmbox

$15/mo

Warmbox runs automated email warmup to lift sender reputation. The listing floor is $15/mo.

Where Warmbox fits

New domains that need a warmup network before cold volume
Solo senders who want a dedicated warmup tool under $20/mo
Agencies warming many client inboxes on a low per-box bill
Teams that already sequence in Instantly and want a second warmup opinion

At a glance

Detail	Folderly	Warmbox
Starting price	$79/mo	$15/mo
Free tier	✓Yes	–No
MCP server	–No	–No
Public API	–No	–No
Listed under	Deliverability	Deliverability

Where they pull apart

Folderly

Stands out: The product is placement and authentication (SPF, DKIM, DMARC, seed-list inbox tests), not a warmup bot and not a sequencer.

Watch out: Folderly does not send your campaigns. You still need Instantly, Smartlead, or Google Workspace as the actual mail server.

Not the right fit for

Teams that only need a $15 warmup mailbox
Buyers looking for a cold-email sequencer

Warmbox

Stands out: $15/mo is the cheapest dedicated warmup listing in this set, below Mailreach's $20/mo and well below Folderly's $79/mo monitor.

Watch out: Warmup is not sending. You still need a sequencer. Results take weeks, and a burned domain will not be saved by a $15 plan alone.

Not the right fit for

Buyers who want inbox-placement analytics, not a warmup bot
Teams that expect warmup to replace authentication and list hygiene

Pros and cons

Folderly

Inbox placement tests rather than warmup-only
Free tier with 2 placement tests a month
Useful when the problem is DNS and reputation, not copy

Does not send or warm the mail for you
Overlap with Instantly's built-in placement features

Warmbox

Published $15/mo listing, low for a dedicated warmup network
Unbundled from any one sequencer
Simple job: reputation, not campaigns

Does not send campaigns or host mailboxes
Overlap with Instantly and Smartlead bundled warmup
Will not rescue a domain with a broken DMARC record

What each one costs

Folderly

$79/mo

Inbox Insights (placement tests before you launch) has a free tier with 2 tests a month, then $79/month for 100 tests, or $799 a year. The core Folderly deliverability product is $96 per mailbox per month on yearly billing. Pulse spam-placement alerts are free. Confirm current terms on the vendor site.

Checked 4 Nov 2026

Warmbox

$15/mo

Warmbox lists from $15/mo for automated email warmup. Confirm live per-mailbox versus flat pricing and any volume packs on the vendor pricing page. Confirm current terms on the vendor site.

Checked 4 Nov 2026

Common questions

Is Folderly cheaper than Warmbox?

Warmbox starts lower, at $15/mo against $79/mo for Folderly. That is the entry plan on each side, so the real number depends on seats and the tier you land on.

Can you try Folderly or Warmbox for free?

Folderly carries a free tier on our listing.

Not the pair you wanted?

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Editorial listings, never paid rankings. Prices checked 4 Nov 2026. Confirm current terms on the vendor site. Spot an error?